Prepare v3.6.0-beta.2 release

[ritazh]

Signed-off-by: Rita Zhang rita.z.zhang@gmail.com

What this PR does / why we need it:

Which issue(s) this PR fixes (optional, using fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when the PR gets merged):
Fixes #

Special notes for your reviewer:

[codecov-commenter]

Codecov Report

Merging #1392 (79eef06) into master (253aa0f) will decrease coverage by 0.28%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1392      +/-   ##
==========================================
- Coverage   49.59%   49.30%   -0.29%     
==========================================
  Files          68       68              
  Lines        4926     4926              
==========================================
- Hits         2443     2429      -14     
- Misses       2138     2148      +10     
- Partials      345      349       +4     

Flag	Coverage Δ
unittests	49.30% <ø> (-0.29%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...onstrainttemplate/constrainttemplate_controller.go	53.07% <0.00%> (-4.21%)	⬇️
pkg/readiness/object_tracker.go	80.97% <0.00%> (-1.64%)	⬇️
pkg/readiness/list.go	91.30% <0.00%> (+8.69%)	⬆️

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[maxsmythe]

LGTM